1. Created by Mr. Lafferty Maths Dept.
Tolerance
Tolerance Notation (percentages)
Tolerance effects
Exam Type Questions
26-May-18
Created by Mr. Lafferty Maths Dept.

2. Created by Mr. Lafferty Maths Dept.
Starter Questions
What is Tolerance ?
26-May-18
Created by Mr. Lafferty Maths Dept.

3. Created by Mr. Lafferty Maths Dept.
Tolerance
Learning Intention
Success Criteria
1. We are learning what
Tolerance is and correct
notation.
Understand the term Tolerance. .
2. Calculate and simplify basic Tolerances.
26-May-18
Created by Mr. Lafferty Maths Dept.

4. Tolerance www.mathsrevision.com
When a builder orders steel bolts to help build a to a house,
he would like them to be 50 millimetres long EXACTLY.
This is not always possible so the builder allows a ‘little error’ either side of this.
26-May-18

5. Tolerance www.mathsrevision.com Tolerance is written as (50±2)mm
He might be prepared to accept any bolt as long as it
lies between 48mm and 52mm
This means he will accept a bolt which is
within 2mm of the 50mm he asked for.
This is referred to as the
TOLERANCE for the measurement.
26-May-18

6. Tolerance 8 + 12 = 10 2 www.mathsrevision.com Tolerance Notation
Example : An acceptable size of apples on sale at Asda
must have a diameter between 8cm and 12cm.
Write the tolerance level in standard notation.
Calculate the middle value
Tolerance is written as
(10±2)cm
8 + 12
= 10 2
26-May-18
Created by Mr. Lafferty Maths Dept.

7. Tolerance 19.9 + 20.1 = 20 2 www.mathsrevision.com Tolerance Notation
Example : For safety reasons an acceptable rivet joint
for an aeroplane joint must be between
19.9mm and 20.1mm in diameter.
Write the tolerance level in standard notation.
Calculate the middle value
Tolerance is written as
(20±0.1)mm
= 20 2
26-May-18
Created by Mr. Lafferty Maths Dept.

8. Tolerance www.mathsrevision.com 10% of 50mph = 5mph
Paul wants drive his car at a speed of 50mph (±10%)
What range of values are acceptable ?
Minimum = 50 – 5 = 45mph
Maximum = = 55mph
Range between 45mph and 55mph
Notation format (50 ± 5)mph
26-May-18

9. Tolerance www.mathsrevision.com 5% of 140 = 7
Stuart wants to get fit so he decides to do 140 sit-ups
± 5% every day for 6 months.
What range of values are acceptable for him
to stay on track ?
Minimum = 140 – 7 = 133
Maximum = = 147
Range between 133 and 147
Notation format (140 ± 7) sit-ups
26-May-18

10. Created by Mr. Lafferty Maths Dept.
Tolerance
Now Try
TJ N5 Lifeskills
Exercise 1
Ch11 (page 112)
26-May-18
Created by Mr. Lafferty Maths Dept.

11. Created by Mr. Lafferty Maths Dept.
Starter Questions
Why is Tolerance important ?
26-May-18
Created by Mr. Lafferty Maths Dept.

12. Created by Mr. Lafferty Maths Dept.
Tolerance
Tolerance Notation
Learning Intention
Success Criteria
We are learning the importance of tolerances in real life.
Understand the effects of tolerance in real life.
26-May-18
Created by Mr. Lafferty Maths Dept.

13. Tolerance www.mathsrevision.com Depends !
Linda measures something and is 2cm out.
Is this acceptable ?
Length of her garden
Probability ok in relation to overall length.
Width of window frame
Probability NOT the new window will not fit !!!
26-May-18

14. Tolerance www.mathsrevision.com A fish tank contains 4500ml of water.
Every hour due the hot temperature (15 ± 1.5)% evaporates. What is the minimum and maximum volume in the tank after 1 hour.
Maximum volume left is
4500 – = ml
Minimum volume left is
4500 – = ml
26-May-18

15. Tolerance Now Try TJ N5 Lifeskills Exercise 2 Ch11 (page 114)
Have you updated your Learning Log ?
Tolerance
Tolerance Notation
Now Try
TJ N5 Lifeskills
Exercise 2
Ch11 (page 114)
26-May-18
Created by Mr. Lafferty Maths Dept.